Malicious PDF — malware analysis report

Static analysis result for SHA-256 1637dd79240d8e49…

MALICIOUS

PDF

90.8 KB Created: 2021-06-28 03:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41da74a3a4303a50596746a257808aea SHA-1: 7ac7eb8ce0f70af411c114cb802d93adeb281402 SHA-256: 1637dd79240d8e4977a3da94402df21c0f33bd88961c454a1ab92522d490891f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://angelescare.com/userfiles/file/wivodepowupejuzevarozivi.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/laxawosajadufurekenupoba.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/26ba375a83d8a0a47f71746be36e7fcc/volewesobug.pdf
    • http://classicalgardenstatues.com/uplds/file/87043428189.pdf
    • https://unosms.us/userfiles/file/zisigonet.pdf
    • https://contabil-fiscal.ro/mm/file/57344096688.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5991ef857---bumevezezipabuk.pdf
    • http://alliance-vietnam.com/upload/files/susirejuselowozepidop.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94521935e6---xapufadikere.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/bajitisotofakub.pdf
    • http://agiusfuneraldirectors.com/files/file/lakajizepesu.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1aae6796---41167706247.pdf
    • http://rauvuonsach.com/images/uploads/files/52998467824.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/99d946306ef54502c90e3a4adcfdb87b/lubisaluboxinexagop.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/035442a4a0ff68a5af5eaf1c16e952a6/relanojofiselipipazoluka.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/60ehgs0ijrphjh05846b3490gl/senigoxe.pdf
    • http://pierrevillers.fr/mairie_files/file/6696447468.pdf
    • https://planet-for-events.de/userfiles/file/53479241070.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ps2rv7ssif0jfdmtvq1u4f7q3j/81193343718.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c9b5107471ce073c1c3e20d62440d827/58340160586.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/zaxetagejujak.pdf
    • http://www.zywawiara.pl/pliki/92324174309.pdf
    • http://studiofantino.it/userfiles/files/83039888003.pdf
    • https://ivanamihic.com//files/75238785905.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/391402fff1acc578bb537911dcb486ab/87489472114.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ab34bc79---51619659403.pdf
    • http://www.alcera.ca/userfiles/file/vasapevara.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pause+for+concern
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010097.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 16792 bytes
font_01_sfnt_off000118ae.bin
ece8437fde7cb991afea768371c9c3cbef1f17bae0dc0a7b095e45b6972c6728
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 10196 bytes
font_02_sfnt_off00012fb2.bin
40b54c9d786ce14db2266153853cb36df06e1a2a5df3feb5f3c344541eacbbf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB2 17736 bytes